feat: Standing matrix on the ticker page (quality x momentum verdict)

Replace the scattered score readouts with one hero: a quality (composite) x
momentum-percentile scatter that plots this ticker against the whole field and
reads out a verdict by quadrant — Strong Buy / Momentum / Accumulate / Pass. The
dashed divider is the activation gate's momentum percentile, so "above the line =
qualifies" is visible at a glance; peers are clickable. Reuses the regime-quadrant
visual language and is lazy-loaded so recharts stays out of the main ticker chunk.

- New StandingMatrix component (composite x momentum, field cloud, verdict).
- ScoreCard gains showComposite (default true); the ticker page now renders it
  without the composite ring (composite lives in the matrix) under "Dimensions".
- Confidence + target probability stay in the recommendation panel (the trade).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/components/ui/ScoreCard.tsx

@@ -6,6 +6,9 @@ interface ScoreCardProps {
   compositeScore: number | null;
   dimensions: DimensionScoreDetail[];
   compositeBreakdown?: CompositeBreakdown;
+  /** Hide the composite ring/header when the composite is shown elsewhere
+   *  (e.g. the Standing matrix) and this card only carries the dimension detail. */
+  showComposite?: boolean;
 }
 
 function scoreColor(score: number): string {
@@ -51,7 +54,7 @@ function ScoreRing({ score }: { score: number }) {
   );
 }
 
-export function ScoreCard({ compositeScore, dimensions, compositeBreakdown }: ScoreCardProps) {
+export function ScoreCard({ compositeScore, dimensions, compositeBreakdown, showComposite = true }: ScoreCardProps) {
   const [expanded, setExpanded] = useState<Record<string, boolean>>({});
 
   const toggleExpand = (dimension: string) => {
@@ -60,27 +63,29 @@ export function ScoreCard({ compositeScore, dimensions, compositeBreakdown }: Sc
 
   return (
     <div className="glass p-5">
-      <div className="flex items-center gap-4">
-        {compositeScore !== null ? (
-          <ScoreRing score={compositeScore} />
-        ) : (
-          <div className="flex h-[88px] w-[88px] items-center justify-center text-sm text-gray-500">N/A</div>
-        )}
-        <div>
-          <p className="text-xs text-gray-500 uppercase tracking-wider">Composite Score</p>
-          <p className={`text-2xl font-bold ${compositeScore !== null ? scoreColor(compositeScore) : 'text-gray-500'}`}>
-            {compositeScore !== null ? Math.round(compositeScore) : '—'}
-          </p>
-          {compositeBreakdown && (
-            <p className="mt-1 text-[10px] text-gray-500 leading-snug max-w-[200px]" data-testid="renorm-explanation">
-              Weighted average of available dimensions with re-normalized weights.
-            </p>
+      {showComposite && (
+        <div className="flex items-center gap-4">
+          {compositeScore !== null ? (
+            <ScoreRing score={compositeScore} />
+          ) : (
+            <div className="flex h-[88px] w-[88px] items-center justify-center text-sm text-gray-500">N/A</div>
           )}
+          <div>
+            <p className="text-xs text-gray-500 uppercase tracking-wider">Composite Score</p>
+            <p className={`text-2xl font-bold ${compositeScore !== null ? scoreColor(compositeScore) : 'text-gray-500'}`}>
+              {compositeScore !== null ? Math.round(compositeScore) : '—'}
+            </p>
+            {compositeBreakdown && (
+              <p className="mt-1 text-[10px] text-gray-500 leading-snug max-w-[200px]" data-testid="renorm-explanation">
+                Weighted average of available dimensions with re-normalized weights.
+              </p>
+            )}
+          </div>
         </div>
-      </div>
+      )}
 
       {dimensions.length > 0 && (
-        <div className="mt-5 space-y-1">
+        <div className={`${showComposite ? 'mt-5' : ''} space-y-1`}>
           <p className="text-[10px] font-medium uppercase tracking-widest text-gray-500">Dimensions</p>
           {dimensions.map((d) => {
             const isExpanded = expanded[d.dimension] ?? false;